/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.org.manhu.chargehelper.Zxing.view;

import java.util.Collection;
import java.util.HashSet;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.GradientDrawable;
import android.util.AttributeSet;
import android.view.View;

import com.google.zxing.ResultPoint;
import com.org.manhu.chargehelper.R;
import com.org.manhu.chargehelper.Zxing.camera.CameraManager;

/**
 * This view is overlaid on top of the camera preview. It adds the viewfinder
 * rectangle and partial transparency outside it, as well as the laser scanner
 * animation and result points.
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class ViewfinderView extends View {

	  private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128, 64};
	  private static final long ANIMATION_DELAY = 100L;
	  private static final int OPAQUE = 0xFF;

	  private final Paint paint;
	  private Bitmap resultBitmap;
	  private final int maskColor;
	  private final int resultColor;
	  private final int resultPointColor;
	  private int scannerAlpha;
	  private Collection<ResultPoint> possibleResultPoints;
	  private Collection<ResultPoint> lastPossibleResultPoints;
	  private boolean laserLinePortrait = true;
	  Rect mRect;
	  int i = 0;
	  GradientDrawable mDrawable;
	  Paint textPaint;
	    /** 
	     * 字体距离扫描框下面的距离 
	     */  
	    private static final int TEXT_PADDING_TOP = 30; 
	    /** 
	     * 手机的屏幕密度 
	     */  
	    private static float density; 
	    /** 
	     * 字体大小 
	     */  
	    private static final int TEXT_SIZE = 16; 
	    /** 
	     * 四个绿色边角对应的长度 
	     */  
	    private int ScreenRate; 
	    /** 
	     * 四个绿色边角对应的宽度 
	     */  
	    private static final int CORNER_WIDTH = 10;  
		/**
		 * 中间滑动线的最顶端位置
		 */
//		private int slideTop;
//		/**
//		 * 中间滑动线的最底端位置
//		 */
//		private int slideBottom;
//		/**
//		 * 中间那条线每次刷新移动的距离
//		 */
//		private static final int SPEEN_DISTANCE = 5;
//		/**
//		 * 扫描框中的中间线的与扫描框左右的间隙
//		 */
//		private static final int MIDDLE_LINE_PADDING = 5;
//		/**
//		 * 扫描框中的中间线的宽度
//		 */
//		private static final int MIDDLE_LINE_WIDTH = 6;
//		boolean isFirst;

	  // This constructor is used when the class is built from an XML resource.
	  public ViewfinderView(Context context, AttributeSet attrs) {
	    super(context, attrs);

	    // Initialize these once for performance rather than calling them every time in onDraw().
	    paint = new Paint();
	    textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
	    mRect = new Rect();
	    int left = Color.parseColor("#CACACA");
		int center = Color.GREEN;
		int right = Color.parseColor("#CACACA");
		mDrawable = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT, new int[] { left, center, right });
	    Resources resources = getResources();
	    maskColor = resources.getColor(R.color.viewfinder_mask);
	    resultColor = resources.getColor(R.color.result_view);
	    resultPointColor = resources.getColor(R.color.possible_result_points);
	    scannerAlpha = 0;
	    possibleResultPoints = new HashSet<ResultPoint>(5);
	    
	    density = context.getResources().getDisplayMetrics().density;
	    //将像素转换成dp  
        ScreenRate = (int)(20 * density); 
	    
	  }

	  @Override
	  public void onDraw(Canvas canvas) {
	    Rect frame = CameraManager.get().getFramingRect();
	    if (frame == null) {
	      return;
	    }
	    
		//初始化中间线滑动的最上边和最下边
//		if(!isFirst){
//			isFirst = true;
//			slideTop = frame.top;
//			slideBottom = frame.bottom;
//		}
	    
	    int width = canvas.getWidth();
	    int height = canvas.getHeight();

	    // Draw the exterior (i.e. outside the framing rect) darkened
	    paint.setColor(resultBitmap != null ? resultColor : maskColor);
	    canvas.drawRect(0, 0, width, frame.top, paint);
	    canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
	    canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
	    canvas.drawRect(0, frame.bottom + 1, width, height, paint);

	    if (resultBitmap != null) {
	      // Draw the opaque result bitmap over the scanning rectangle
	      paint.setAlpha(OPAQUE);
	      canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
	    } else {

	    	paint.setColor(Color.GREEN);
//			//画出四个角
//			canvas.drawRect(frame.left - 10, frame.top - 10, frame.left + 20, frame.top, paint);
//			canvas.drawRect(frame.left - 10, frame.top - 10, frame.left, frame.top + 20, paint);
//			canvas.drawRect(frame.right - 20, frame.top - 10, frame.right + 10, frame.top, paint);
//			canvas.drawRect(frame.right, frame.top - 10, frame.right + 10, frame.top + 20, paint);
//			canvas.drawRect(frame.left - 10, frame.bottom + 10, frame.left + 20, frame.bottom, paint);
//			canvas.drawRect(frame.left - 10, frame.bottom + 10, frame.left, frame.bottom - 20, paint);
//			canvas.drawRect(frame.right - 20, frame.bottom + 10, frame.right + 10, frame.bottom, paint);
//			canvas.drawRect(frame.right, frame.bottom + 10, frame.right + 10, frame.bottom - 20, paint);
	    	
	    	 //画扫描框边上的角，总共8个部分  
            paint.setColor(Color.GREEN);  
            canvas.drawRect(frame.left, frame.top, frame.left + ScreenRate,  
                    frame.top + CORNER_WIDTH, paint);  
            canvas.drawRect(frame.left, frame.top, frame.left + CORNER_WIDTH, frame.top  
                    + ScreenRate, paint);  
            canvas.drawRect(frame.right - ScreenRate, frame.top, frame.right,  
                    frame.top + CORNER_WIDTH, paint);  
            canvas.drawRect(frame.right - CORNER_WIDTH, frame.top, frame.right, frame.top  
                    + ScreenRate, paint);  
            canvas.drawRect(frame.left, frame.bottom - CORNER_WIDTH, frame.left  
                    + ScreenRate, frame.bottom, paint);  
            canvas.drawRect(frame.left, frame.bottom - ScreenRate,  
                    frame.left + CORNER_WIDTH, frame.bottom, paint);  
            canvas.drawRect(frame.right - ScreenRate, frame.bottom - CORNER_WIDTH,  
                    frame.right, frame.bottom, paint);  
            canvas.drawRect(frame.right - CORNER_WIDTH, frame.bottom - ScreenRate,  
                    frame.right, frame.bottom, paint);

			//画扫描框下面的字  
			int middle = frame.width() / 2;
			textPaint.setColor(Color.WHITE);
            paint.setTextSize(TEXT_SIZE * density);  
            paint.setAlpha(0x40);  
			String text = getResources().getString(R.string.scan_text);
			float textWidth = paint.measureText(text);
			//canvas.drawText(text, middle - 112, frame.bottom + 60, textPaint);
            canvas.drawText(text, (width - textWidth)/2, (float) (frame.bottom + (float)TEXT_PADDING_TOP * density), paint);
            
			// Draw a red "laser scanner" line through the middle to show
			// decoding is active
			paint.setColor(Color.RED);
			paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
			scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
			
			//上下走的线
			if (laserLinePortrait) {
				if ((i += 3) < frame.bottom - frame.top) {
					/*
					 * canvas.drawRect(frame.left + 2, frame.top - 2 + i, frame.right - 1, frame.top + 2 + i, paint);
					 */
					int r = 8;
					mDrawable.setShape(GradientDrawable.RECTANGLE);
					mDrawable.setGradientType(GradientDrawable.LINEAR_GRADIENT);
					setCornerRadii(mDrawable, r, r, r, r);
					mRect.set(frame.left + 2, frame.top - 3 + i, frame.right - 1, frame.top + 3 + i);
					mDrawable.setBounds(mRect);
					mDrawable.draw(canvas);
					invalidate();
				} else {
					i = 0;
				}
			} else {
				float left = frame.left + (frame.right - frame.left) / 2 - 2;
				canvas.drawRect(left, frame.top, left + 2, frame.bottom - 2, paint);
			}
			
//			//绘制中间的线,每次刷新界面，中间的线往下移动SPEEN_DISTANCE
//			slideTop += SPEEN_DISTANCE;
//			if(slideTop >= frame.bottom){
//				slideTop = frame.top;
//			}
//			canvas.drawRect(frame.left + MIDDLE_LINE_PADDING, slideTop - MIDDLE_LINE_WIDTH/2, frame.right - MIDDLE_LINE_PADDING,slideTop + MIDDLE_LINE_WIDTH/2, paint);
			
			Collection<ResultPoint> currentPossible = possibleResultPoints;
			Collection<ResultPoint> currentLast = lastPossibleResultPoints;
			if (currentPossible.isEmpty()) {
				lastPossibleResultPoints = null;
			} else {
				possibleResultPoints = new HashSet<ResultPoint>(5);			
				lastPossibleResultPoints = currentPossible;
				paint.setAlpha(OPAQUE);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentPossible) {
					// canvas.drawCircle(frame.left + point.getX(), frame.top +
					// point.getY(), 6.0f, paint);
					/*
					 * canvas.drawCircle(frame.left + point.getY(), frame.top + point.getX(), 6.0f, paint);
					 */
				}
			}
			if (currentLast != null) {
				paint.setAlpha(OPAQUE / 2);
				paint.setColor(resultPointColor);
				for (ResultPoint point : currentLast) {
					/*
					 * canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 3.0f, paint);
					 */
				}
			}

	      // Request another update at the animation interval, but only repaint the laser line,
	      // not the entire viewfinder mask.
	      postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
	    }
	  }

	  public void drawViewfinder() {
	    resultBitmap = null;
	    invalidate();
	  }
	  
		public void setCornerRadii(GradientDrawable drawable, float r0, float r1, float r2, float r3) {
			drawable.setCornerRadii(new float[] { r0, r0, r1, r1, r2, r2, r3, r3 });
		}

	  /**
	   * Draw a bitmap with the result points highlighted instead of the live scanning display.
	   *
	   * @param barcode An image of the decoded barcode.
	   */
	  public void drawResultBitmap(Bitmap barcode) {
	    resultBitmap = barcode;
	    invalidate();
	  }

	  public void addPossibleResultPoint(ResultPoint point) {
	    possibleResultPoints.add(point);
	  }

	}